Allan Bloom delivered this talk as part of the series entitled "Philosophic Perspectives" at Boston College in 1983. The series was intended to help teachers of undergraduates in their teaching of those great works that are essential to a liberal education. The series addressed the decline of liberal learning in the Universities, in America especially. This lecture presents an interpretation of Aristotle's Ethics. The structure of the book and the best ways of life that emerge from it are discussed. This is the only surviving part of this lecture that could be found at the time of copying (1995). Father Ernest Fortin helped in recovering it. It complements Bloom's discussions of Plato, Machiavelli,Hobbes, Locke, Rousseau,Tocqueville, & Nietzsche, all of which will eventually be uploaded to the Internet Archive.